#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main() {
	int arr[] = { 1,3,5,8,7,8,5,3,1,9 };
	int i = sizeof(arr[]) / arr[0];
	int m = 0;
	for (int j = 0; j < i; j++) {
		m = m ^ arr[j];
	}
	printf("%d", m\n);
}